Bulb holder



FIG. 1 is a perspective view of a bulb holder showing our new design;

FIG. 2 is a front view thereof, and the back, left and right views are identical to the front view;

FIG. 3 is a top view thereof; and,

FIG. 4 is a bottom view thereof.

The broken lines shown in the drawings are included for the purpose of illustrating portions of the bulb holder that form no part of the claimed design. 

CLAIM The ornamental design for a bulb holder, as shown and described. 